Perhaps you should try some spelling variations:
tang hanh » tang thanh, dang hanh, nang hanh
thu sach » tu sach, thuat sach, thuoc sach
duc tang » duc thang, duc tan, tuc tang
sach ly » sach y, sach lo, sach ty
cua tre » cua te, cuu tre, cua triet
mai hoi » mai khoi, dai hoi, lai hoi
ly nang » ky nang, ly hang, ly vang
va cao » va cac, va co, va dao
ma hoi » xa hoi, ma hoa, me hoi
vi cua » vai cua, di cua
va cam » va cham, va cac, va cai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ly nang ((ma hoi) or (mai hoi)). lieu ((va cam) OR (va cao)) duc tang hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ly nang ((ma hoi) OR (mai hoi)). lieu ((va cam) OR (va cao)) duc tang hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ly nang ((ma hoi) or (mai hoi)). lieu ((va cam) OR (va cao)) duc tang hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ly nang ((ma hoi) or (mai hoi)). lieu ((va cam) OR (va cao)) duc tang hanh vi cua tre*.